Conjurer's Closet + Eternal Witness + Time Warp

Conjurer's Closet

Eternal Witness

Time Warp

How it works

1. Cast Time Warp by paying 3, taking an extra turn after this one.
2. At the beginning of your end step, Conjurer's Closet triggers, blinking Eternal Witness.
3. Eternal Witness enters the battlefield, returning Time Warp from your graveyard to your hand.
4. Repeat.

By casting Time Warp, you secure an extra turn to set up your engine, while Conjurer's Closet anchors the loop by systematically blinking your board at the beginning of each end step. When Eternal Witness enters the battlefield through this exile-and-return effect, its triggered ability reaches into your graveyard to retrieve Time Warp, putting the extra-turn spell right back into your hand. Because Conjurer's Closet triggers reliably during every single end step, you can loop this sequence indefinitely to take all the time in the world.